STBC-MIMO - MC-CDMA系统中多用户检测的自适应最小误码率方法

L. D'Orazio, C. Sacchi, Riccardo Fedrizzi, F. D. Natale
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引用次数: 13

摘要

近年来,MIMO MC-CDMA技术被提出,以增加在频率选择无线信道上的系统容量。MIMO MC-CDMA的主要特点是能够在时间、频率和空间领域共同利用分集。STBC-MIMO MC-CDMA采用旨在最大化分集合成器输出信噪加干扰比(SINR)的接收方案,取得了非常有希望的结果。这一概念开启了最小均方误差(MMSE)组合准则。然而,文献表明,MSE成本函数在数字通信中并不总是最优的。在这项工作中,我们提出了一种基于最小误码率(M- BER)概念的自适应多用户检测方法,用于在时变多径衰落信道上传输数据的同步STBC-MIMO MC-CDMA系统。M-BER接收机的实际实现依赖于自适应最小均方(LMS)算法,周期性地由训练序列辅助,并在相干时间窗内以决策导向的方式工作。实验结果表明,与MMSE自适应MUD相比,所提出的自适应M-BER MUD的性能得到了提高,并且花费了可承受的计算量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An Adaptive Minimum-BER Approach for Multi-User Detection in STBC-MIMO MC-CDMA Systems
In the recent years, MIMO MC-CDMA techniques have been proposed in order to increase system capacity over frequency-selective wireless channels. The key feature of MIMO MC-CDMA is the capability of exploiting diversity jointly in time, frequency and in the space domains. Very promising results have been achieved by STBC-MIMO MC-CDMA using receiver schemes targeted to maximize the signal-to-noise plus interference ratio (SINR) at the output of the diversity combiner. Such a concept turns on the minimum mean squared error (MMSE) combining criterion. Nevertheless, it is known by literature that MSE cost function is not always optimal in digital communications. In this work, we are proposing an adaptive multi-user detection approach based on a minimum-BER (M- BER) concept for a synchronous STBC-MIMO MC-CDMA system transmitting data over time-varying multipath fading channels. The practical implementation of the M-BER receiver relies on an adaptive least-mean-square (LMS)-like algorithm, periodically aided by a training sequence and working in decision-directed modality during a coherence time window. Experimental results have shown a performance improvement yielded by the proposed adaptive M-BER MUD with respect to MMSE adaptive MUD achieved by spending an affordable computational effort.
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